To provide a helmet for ski jump games, having an air flow-arranging function and capable of releasing an air flow from a preferable position of a head portion, reducing air resistance and generating a lifting force.

Many projections 6 or depressions for releasing an air flow are disposed in parallel to each other on the surfaces of the front head portion 3, top head portion 2 or side head portion 4 of a helmet main body 1 surrounding the top head portion, front head portion, side head portions and rear head portion of a player so as to cross the direction of the air flow. Thereby, the air flow flowing from the front head portion to the top head portion and the rear head portion is released from the surface of the helmet main body to reduce the resistance of air and generate a lifting force.